The distance between two real numbers and is the absolute value of their difference.
Here .
.
The distance between the points is .
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c83e8fa0c2a6b424122e13bb41df2a55.png\")
and ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=27644d1bd3f23f010446240708ae444d.png\")
is the absolute value of their difference. and is the absolute value of their difference.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2a8202419dcc4d1a87bcf6e691b5643e.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=21e471ceae94608067ac99c7dc2ef34e.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=596dbfdc822a43adb27d19f5c360ac2a.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=596dbfdc822a43adb27d19f5c360ac2a.png\")
.